Fig. 5

Correspondence of the values of the PAM parameter to the average percentage of identity in the positions of the ancestral and mutant sequences (%id). In a mutant sequence, only substitutions are allowed. Note that the maximum PAM value shown in Table 23 of [1] is 328 and corresponds to %id = 15%. For %id values less than 15%, PAM values are added by polynomial approximation at six points